AP EAMCET · PHYSICS · Semiconductors
In a \(p\)-type semiconductor the donor level is at \(50 \mathrm{meV}\) above the valence band. To produce one electron, the maximum wavelength of light photon required is (Planck's constant, \(h=6.6 \times 10^{-34} \mathrm{Js}\) and speed of light in vacuum, \(c=3 \times 10^8 \mathrm{~ms}^{-1}\) )
- A \(0.0248 \mu \mathrm{m}\)
- B \(0248 \mu \mathrm{m}\)
- C \(2.48 \mu \mathrm{m}\)
- D \(24.8 \mu \mathrm{m}\)
Answer & Solution
Correct Answer
(A) \(0.0248 \mu \mathrm{m}\)
Step-by-step Solution
Detailed explanation
Given, \(p\)-type semiconductor donor energy level, \(E=50 \mathrm{meV}=50 \times 10^{-3} \times 1.6 \times 10^{-19} \mathrm{~V}\) Planck's constant, \(h=6.6 \times 10^{-34} \mathrm{Js}\) speed of light in vacuum, \(c=3 \times 10^8 \mathrm{~m} / \mathrm{s}\) Now, for the maximum…
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